﻿// Copyright 2007-2017 Chris Patterson, Dru Sellers, Travis Smith, et. al.
//  
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the 
// License at 
// 
//     http://www.apache.org/licenses/LICENSE-2.0 
// 
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
// CONDITIONS OF ANY KIND, either express or implied. See the License for the 
// specific language governing permissions and limitations under the License.
namespace MassTransit.Initializers.Conventions
{
    /// <summary>
    /// A convention cache for type specified, which converts to the generic type requested
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public interface IConventionTypeCache<in T>
        where T : class
    {
        /// <summary>
        /// Returns the cached item for the specified type key, creating a new value
        /// if one has not yet been created.
        /// </summary>
        /// <typeparam name="TKey"></typeparam>
        /// <typeparam name="TResult"></typeparam>
        /// <returns></returns>
        TResult GetOrAdd<TKey, TResult>()
            where TKey : class
            where TResult : class, T;
    }
}